Bernd: Thanks for your guide. But there is still a question if recvfrom() used, how to figure out the client's dest ip for reply ? i.e. on which ip the server receieved the request when construct the IP header, i don't know which saddr to fill in Thanks. 2011/10/18 Bernd Petrovitsch <bernd@xxxxxxxxxxxxxxxxxxx>: > On Die, 2011-10-18 at 07:26 +0800, tao jiang wrote: > [....] >> Is it to create a SOCK_RAW socket for receieve and send? > > Only for sending. Search for sourcecode for `ping` - there are > several around that show how to do it. > > You can use recvfrom() to get the senders address for each packet. > > [...] >> Will it cause performance problem, compare to SOCK_DGRAM? > > IMHO that won't measurably - either user-space constructs the UDP and IP > header or the kernel does. And we talk about a few bytes only. > > [ Don't top-post. ] > > Bernd > -- > Bernd Petrovitsch Email : bernd@xxxxxxxxxxxxxxxxxxx > LUGA : http://www.luga.at > > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
